move the ovpsim mem variable configuration to an HDL path

Created by: strichmo

Enables Imperas to restructure memory storage variable as needed. Enables interfaces to avoid cross-module references to remain SV LRM compliant. @eroom1966 will need to fix the path from bus.mem in cv32e40x/tests/uvmt/base-tests/uvmt_cv32e40x_base_test.sv

      // FIXME: Lee Moore, please revert this commented out line when mem variable is moved back to ram
      //rvvi_ovpsim_cfg.ovpsim_mem_path = "uvmt_cv32e40x_tb.iss_wrap.ram.mem";
      rvvi_ovpsim_cfg.ovpsim_mem_path = "uvmt_cv32e40x_tb.iss_wrap.bus.mem";

Signed-off-by: Steve Richmond Steve.Richmond@silabs.com